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MC145745FW データシート(PDF) 4 Page - Motorola, Inc |
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MC145745FW データシート(HTML) 4 Page - Motorola, Inc |
4 / 16 page MC145745 MOTOROLA 4 PIN DESCRIPTIONS (continued) Pin Location Description Type Symbol 25 TxA2 O Transmit Buffer Output 2 (Inverting) — This pin is the inverting output of the line driver. When VCC = 5 V, + 7 dBm (typ), differential output voltage (VTxA1 – VTxA2), can be obtained with a load of 1.2 kΩ between pins TxA1 and TxA2. In typical applications, the output level on the telephone line will be half of the differential output (refer to Application Circuit). 26 TxA1 O Transmit Buffer Output 1 (Non–Inverting) — This pin is the non–inverting output of the line driver. Refer to TxA2. 27 RxA I Receive Signal Input — This pin is the analog signal input which has 500 k Ω input resistance (typ). ABSOLUTE MAXIMUM RATINGS Rating Symbol Value Unit DC Supply Voltage VCC – 0.5 to + 7.0 V DC Input Voltage Vin – 0.5 to VCC + 0.5 V DC Output Voltage Vout – 0.5 to VCC + 0.5 V DC Input Current Iin ± 20 mA DC Output Current Iout ± 25 mA Power Dissipation PD 500 mW Storage Temperature Range Tstg – 65 to + 150 °C RECOMMENDED OPERATIONAL CONDITIONS Parameter Symbol Min Typ Max Unit DC Supply Voltage VCC 3.3 5.0 5.5 V DC Input Voltage Vin 0 — VCC V DC Output Voltage Vout 0 — VCC V Crystal Oscillation Frequency fosc — 3.579545 — MHz External Input Frequency (ECLK) — 7.15909 — Operating Temperature Range TA – 30 25 + 85 °C DC ELECTRICAL CHARACTERISTICS (VCC = + 3.3 to + 5.5 V, TA = – 30 to + 85°C) Characteristic Symbol Conditions Min Typ Max Unit Input Voltage (TxD, ECLK, RESET, SCP R SCPCLK High Level VIH 0.7 x VCC — — V ( SCP Rx, SCPCLK, SCPEN) Low Level VIL — — 1.1 Output Voltage (RxD CD CLKO High Level VOH Vin = VIH or VIL, Iout = 20 µA VCC – 0.1 VCC – 0.01 — (RxD, CD, CLKO, PB0–3, SCP Tx) Low Level VOL Vin = VIH or VIL Iout = 20 µA Iout = 2 mA — — 0.01 — 0.1 0.4 Input Leakage Current (TxD, ECLK, RESET, SCP Rx, SCPCLK, SCPEN) Iin Vin = VCC or GND — ± 1.0 ± 10.0 µA Quiescent Supply Current VCC = 5 V ICC FSK Mode, RTLA = 0 TxA1 and TxA2 open — 7 — mA DTMF Receive Mode, no input — 9 — VCC = 3.6 V ICC FSK Mode, RTLA = 0 TxA1 and TxA2 open — 6 — DTMF Receive Mode, no input — 8 — Power–Down Supply Current ICC Power–Down Mode 1 — — 500 µA Power–Down Mode 2 — — 1.0 µA This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields. However, it is advised that normal precautions be taken to avoid ap- plications of any voltage higher than maximum rated voltages to this high impedance circuit. For proper operation, it is recommended that Vin and Vout be constrained to the range GND v (Vin or Vout) v VCC. Reliability of operation is enhanced if unused logic inputs are tied to an appropriate logic volt- age level (e.g., either GND or VCC). |
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同様の説明 - MC145745FW |
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